Tumor Stage and Grade for Study Population (n = 45)
| Characteristic | TNM stage | Number of patients |
| Stage I (n = 9) | T1N0M0 | 5 |
| T2N0M0 | 4 | |
| Stage II (n = 14) | T3N0M0 | 14 |
| T4aN0M0/T4bN0M0 | 0/0 | |
| Stage III (n = 13) | T2N1M0/T2N2M0 | 1/0 |
| T3N1M0/T3N2M0 | 4/2 | |
| T4abN1M0/T4abN2M0 | 3/3 | |
| Stage IV (n = 9) | T2N1M1 | 1 |
| T3N0M1/T3N1M1/T3N2M1 | 0/1/4 | |
| T4N1M1 | 3 | |
| Moderately differentiated | 36 | |
| Poorly differentiated | 9 |